NRV075 Shaft Input Worm Gearbox 230Nm 7.5-100:1 Aluminum

NRV075 Aluminum shaft-input worm gear reducer by EVER-POWER. 075 mm centre, ratios 7.5:1 to 100:1, max 230 Nm, 0.25-2.2 kW. Solid 28 mm input shaft accepts belt, chain, or sprocket drives. Output shaft 28 mm H8; 35 mm on request. All six mounting orientations. Max Fr2 7,380 N. IP55, ISO 9001, CE. MOQ 10. EVER-POWER PTE. LTD., Singapore.

Description

NRV075 — Aluminum Shaft-Input Worm Gear Reducer · EVER-POWER PTE. LTD.

ISO 9001CE

CENTRE DISTANCE

075 mm

GEAR RATIO

7.5 – 100

MAX OUTPUT TORQUE

230 Nm

INPUT TYPE

Shaft Input

28 mm solid shaft

HOUSING

Aluminum

9 kg

7,380 N

MAX RADIAL LOAD FR2

28 mm H8

OUTPUT SHAFT

0.25–2.2 kW

INPUT POWER

9 kg

UNIT WEIGHT

IP55

PROTECTION

Product Overview

NRV075 Shaft-Input Worm Gear Reducer

Single-stage worm gearbox · 075 mm centre · 0.25–2.2 kW shaft input · ratios 7.5:1–100:1 · medium-duty shaft-input conveyor and mixer drives

NRV075 aluminum shaft input worm gear reducer right angle

28 mm H8 Output shaft diameter	230 Nm Max output torque
7,380 N Max radial load Fr2	28 mm Input shaft diameter
9 kg Housing weight	0.55 L Oil fill (B3)

The NRV075 raises the shaft-input worm gearbox performance to 230 Nm peak output torque within a die-cast aluminum housing of just 9 kg. Its 28 mm solid input shaft handles chain and belt drives at the power levels demanded by medium-duty continuous conveying and mixing applications, while the 28 mm H8 standard output bore (35 mm on request) accommodates a wide range of sprocket and coupling fits.

Pre-filled synthetic oil supports all six mounting orientations, and a torque-arm accessory prevents hollow-bore axial loading in shaft-mount installations. The NRV075 also pairs as the low-speed stage in two-stage worm combinations with the NMRV040, extending the ratio ceiling to 5,000:1.

Shaft Configuration

Input Shaft Types & Output Options

AS/AB solid output shaft · VS double input · F/FL flange output · hollow bore

Output Shaft Positions — AS (single) / AB (double) / VS (double-input)

AS single · AB double output

VS — double input shaft extension

NRV075 low speed shaft dimensional table

Low-speed shaft reference

Flange Output & Input Shaft Specifications

Flange output F/FL — specify FA, FB, FC, or FD at order

Input Shaft Specifications — NRV075

Parameter	Specification	Note
Input shaft diameter	28 mm solid	20CrMnTi steel, carburized 56-62 HRC
Keyway width	8 mm	DIN 6885 parallel key, tolerance JS9
Max input speed	1,500 rpm	Verify thermal rating above 1,400 rpm
Input extension	AS single / VS double (suffix)	Specify VS at order for double-end shaft

Output bore 28 mm H8; 35 mm on request. Input shaft 28 mm solid.

Mounting Positions

Six Standard Orientations — Universal Mounting

Ambient −5°C to +40°C · pre-filled synthetic oil supports all six positions

NRV075 mounting positions B3 B8 B6 B7 V5 V6 six orientations

Terminal Box & Torque Arm Positions

Terminal box — F1 / F2

Torque arm — A1 / A2

Pre-filled synthetic lubricant supports all six mounting orientations; no quantity change is needed when reorienting. B3 fill: 0.55 L synthetic ISO VG 320. For hollow-bore shaft-mount installations, always fit the torque arm to prevent axial loading.

Dimensional Data

NRV075 Specification Drawing

Full dimensional drawing — input shaft, output shaft, flange, fixing holes

NRV075 specification dimensional drawing outline dimensions tolerances

Key Shaft & Keyway Dimensions

Dimension	Standard	On request	Keyway b	Keyway t
Output bore D H8	28 mm	35 mm (request)	8 mm	31.3 mm
Input shaft D1	28 mm	—	8 mm	—
Centre distance I	075 mm	—	—	—

Accessories

Protection Cover, Torque Arm & Optional Fittings

All accessories factory-fitted — specify at order placement

Protection cover — N2=74 mm

Torque arm — K1=200 mm

Accessory	Part ref.	Key dimension	Function
Protection Cover	N1 · 075	N2=74 mm	Dust/splash guard for hollow output bore
Torque Arm	K1=200 mm	KG=47.5 KH=20 R=30	Reaction torque restraint for shaft-mount installations
Viton Lip Seals	VT option	Replaces std. NBR	Chemical/solvent-resistant seals for harsh environments
Food-Grade Oil	FG option	NSF H1 / VG 220	Factory-fitted for food-contact adjacent applications

Performance Data

NRV075 Full Parameter Table & Radial Load Charts

All values at n1=1400 rpm · source: EVER-POWER NRV catalog

P1 kW	n2 rpm	M2 Nm	Serv. factor	Ratio i	Fr2 N
0.25	186.7	86	1.0	7.5	2785
0.37	186.7	135	1.2	7.5	2785
0.55	186.7	108.1	2.0	7.5	4160
0.55	140	129	1.6	10	4421
0.75	186.7	102.3	2.0	7.5	4160
0.75	93.3	200	1.0	15	5569
1.1	186.7	201.1	1.2	7.5	4865
1.1	140	274.2	1.9	10	6130
1.5	186.7	280.1	0.9	7.5	6000
1.5	140	313	1.0	10	6375
2.2	186.7	349.2	2.1	7.5	5092
2.2	140	455	1.8	10	5605

P1=input power · n2=output speed · M2=output torque · Fr2=max radial load at output shaft midpoint

Worm Thread Geometry — Mesh Data

Ratio i	Z1	Helix angle	Module mx	Eff. dynamic	Eff. static
7.5	4	26deg33'	4.0	0.88	0.70
10	4	21deg48'	3.0	0.87	0.67
15	2	14deg02'	4.0	0.84	0.60
20	2	11deg18'	3.0	0.81	0.57
25	2	9deg37'	2.45	0.79	0.52
30	1	7deg07'	4.0	0.75	0.46
40	1	5deg42'	3.0	0.71	0.42
50	1	4deg50'	2.45	0.68	0.38
60	1	4deg05'	2.0	0.64	0.35
80	1	3deg15'	1.54	0.59	0.29
100	1	2deg40'	1.24	0.54	0.26

Permissible Radial Load — Charts and Tables

Output shaft Fr2 — permissible radial load

NRV075 applied radial load output shaft Fr2 chart

Fr2 vs. output speed n2

Output speed n2	Fr2 max (N)
400 rpm	2160 N
250 rpm	2520 N
150 rpm	2990 N
100 rpm	3430 N
60 rpm	4060 N
40 rpm	4650 N
25 rpm	5440 N
10 rpm	7380 N

Max axial = Fr2 ÷ 5 when both act simultaneously.

Input shaft Fr1 — permissible radial load

NRV075 applied radial load input shaft Fr1 chart

Fr1 vs. input speed n1

Input speed n1	Fr1 max (N)
1400 rpm	700 N
900 rpm	810 N
500 rpm	980 N

Size input sprocket to keep Fr1 below tabulated limit.

Selection & Lubrication

Service Factor, Oil Grade & Fill Volume

NRV075 ships pre-filled synthetic ISO VG 320 · apply service factor before finalising

Service Factor f.s.

Load type (5 starts/h)	2 h/d	8 h/d	16 h/d	24 h/d
A — Uniform (fa ≤ 0.3)	1.6	1.4	1.2	1.0
B — Moderate shock (fa ≤ 3)	1.9	1.7	1.5	1.3
C — Heavy shock (fa ≤ 10)	2.2	2.0	1.8	1.6

fa=Jex/Jm. Contact EVER-POWER when fa>10.

Recommended Lubricants

Brand	Synthetic	Mineral alt.	ISO Grade
Shell	Tivela SC 320	Omala 220	VG 320
Agip	Blasia S 320	Blasia 220	VG 320
Mobil	Glygoyle 30	Mobilgear 220	VG 320
Castrol	Alphasyn PG 320	Alpha Max 220	VG 320
IP	Telium VSF	Mellana Oil 220	VG 320

Oil Fill Volume — NRV075

Mounting position	Synthetic VG 320 (L)
B3 — foot horizontal	0.55
B8 — foot shaft-up	adjust per chart
B6/B7 — flange vertical	adjust per chart
V5/V6 — flange horizontal	0.55

First check at 200 h; change at 5,000 h or 18 months. Synthetic pre-fill supports all six orientations without adjustment.

Fault Diagnosis

Troubleshooting Guide — NRV075 in Service

Field-level diagnosis for the most common shaft-input worm reducer failure modes

Symptom	Probable Cause	Corrective Action
1 Intermittent vibration during run	Input shaft misalignment exceeding 0.05 mm; loose foot bolts	Laser-align drive train; re-torque foot bolts to 12 Nm; check for soft-foot
2 Oil leakage at both shaft seals	Overpressure from blocked breather; excess oil	Clean breather plug; verify oil quantity matches position table; replace both seals
3 Housing too hot to touch	Overload beyond rated M2; ambient above 40 degC	Derate to 80% rated torque; improve airflow; consider VG 220 for high-ambient
4 Output shaft does not rotate	Worm wheel stripped; foreign body ingress	Open housing; inspect worm wheel; replace assembly if tooth loss found
5 High backlash after 6,000 h	Normal worm-wheel wear at sustained high torque	Measure angular backlash; exceed 0.5 deg signals replacement

Industrial Applications

Where NRV075 Shaft-Input Worm Reducers Are Specified

Belt, chain, and shaft-coupled drives for medium-duty shaft-input conveyor and mixer drives

Heavy Conveyor Drive

The NRV075 handles continuous belt-conveyor and chain-drive duties at 230 Nm, suited to both fixed and variable-speed belt-input drives.

Large-Vessel Agitator

High-volume batch and continuous-process mixers driven from V-belt transmissions in chemical and food plants.

Gate and Sluice Actuator

Large gate and sluice drives accepting gear or hand-wheel input; self-locking above 30:1 for passive load holding.

Agricultural Machinery

High-torque auger and spreader drives powered from a PTO shaft or line-shaft chain drive.

Winch and Hoist

Chain and cable hoists accepting sprocket input on the NRV075 worm shaft; self-locking provides passive braking.

Screw Conveyor

Large-capacity bulk-material screw conveyors driven from chain or belt transmissions at the NRV075 torque ceiling.

For motor-flange input, see the equivalent NMRV075 model. For complementary engineering support and two-stage combinations, see the helical gearbox range. Contact EVER-POWER for selection assistance. MOQ 10 units.

EVER-POWER PTE. LTD.

Singapore · NRV075 Shaft-Input Worm Gear Reducer Manufacturer since 2004

ISO 9001ISO 14001ISO 45001CE

60,000 m²

Combined production floor, three sites

3,000+

Projects in 60+ countries

10,000+

Industrial customers worldwide

68+

Granted patents

56–62 HRC

Worm shaft surface hardness after carburizing

Triple ISO

ISO 9001 · 14001 · 45001

FAQ

Frequently Asked Questions — NRV075

Technical answers from EVER-POWER engineers

NRV075 Shaft-Input Worm Gear Reducer — FAQ

How does the NRV075 compare with the NRV063 for shaft-input drives?

The NRV075 adds 63 Nm of peak torque (230 Nm vs 167 Nm) and raises the input power ceiling to 2.2 kW. The input shaft grows from 24 mm to 28 mm. For belt or chain drives sitting at the top of the 063 torque range, the 075 provides the direct upgrade.

What input shaft diameter does the NRV075 use?

28 mm solid input shaft with an 8 mm keyway. This is a common shaft diameter for medium-duty industrial sprockets and V-belt pulleys.

Is the 35 mm output bore available?

Yes. Standard bore is 28 mm H8; 35 mm H8 is available on request for large-bore coupling fits in heavy conveyor and mixer installations.

What is the maximum radial load on the NRV075 output shaft?

7,380 N at n2 = 10 rpm applied at the shaft midpoint. This is sufficient for most sprocket and sheave drives in medium-duty conveying. Consult the radial load chart for your actual output speed.

Can the NRV075 handle a V-belt input?

Yes. Size the V-belt pulley to keep the Fr1 input shaft radial load below the table values at your belt tension and input speed. At 1400 rpm the Fr1 maximum is 700 N.

What two-stage combinations use the NRV075?

The NMRV040/NRV075 combination covers 300:1 to 5,000:1, with the NRV075 as the low-speed driven stage. Pre-engineered data is listed in the double-stage worm gearbox section.

Ready to order?

Request a Quote for NRV075 Shaft-Input Worm Reducer

Engineers respond within 24 h. Provide ratio, input power, mounting, and quantity. MOQ 10 units · OEM/ODM · worm gearbox range · technical blog

Request Quote →All NRV Models Full Gearbox Range

Gear Reducers

World class gear manufacturing capabilities, quality material suppliers, and a state of the art quality process allows EPT to offer the highest level of precision, durability and endurance. The EPT Planetary Reducers are designed and built for advanced high speed low backlash applications. The EPT manufacturing processes allows us to offer exceptional shock load capacities and various mounting options.

Surface Treatment

Annealing, natural canonization, heat treatment, polishing, nickel plating, chrome plating, zinc plating,yellow passivization, gold passivization, satin, Black surface painted etc.

Processing Method

CNC machining, punch,turning, milling, drilling, grinding, broaching, welding and assembly

QC & Certificate

Technicians self-check in production,final-check before package by professional Quality inspector
ISO9001:2008 , ISO14001:2001,ISO/TS 16949:2009

Package & Lead Time

Size: Drawings
Wooden Case/Container and pallet, or as per customized specifications.
15-25days samples. 30-45days offcial order
Port: Shanghai/Ningbo port

FAQ

Q: Are you trading company or manufacturer ?
A: Our group consists in 3 factories and 2 abroad sales corporations.

Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.

Q: How long is your delivery time ? What is your terms of payment ?
A: Generally it is 40-45 days. The time may vary depending on the product and the level of customization. For standard products, the payment is: 30% T/T in advance ,balance before shipment.

Q: What is the exact MOQ or price for your product ?
A: As an OEM company, we can provide and adapt our products to a wide range of needs.Thus, MOQ and price may greatly vary with size, material and further specifications; For instance, costly products or standard products will usually have a lower MOQ. Please contact us with all relevant details to get the most accurate quotation.